Experimental study of enhanced backscattering from a highly irregular, acoustic–elastic interface
作者:
Craig A. Schultz,
M. Nafi Toksöz,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1996)
卷期:
Volume 99,
issue 2
页码: 880-892
ISSN:0001-4966
年代: 1996
DOI:10.1121/1.414674
出版商: Acoustical Society of America
关键词: ACOUSTIC MEASUREMENTS;BACKSCATTERING;GLASS;ROUGHNESS;SEISMIC P WAVES;SOUND WAVES;STATISTICS
数据来源: AIP
摘要:
In this study, experimental and numerical statistical models are developed for the scattering of an acousticPwave which is incident on a highly irregular, random acoustic–elastic interface to determine the general nature of reflected energy. It is then elucidated whether or not enhanced backscattering, already identified numerically for acoustic (SH) and fully elastic media (P‐SV), occurs. Experimentally, a glass etching process using photoresist templates with Gaussian statistics allowed for the generation of characterized interface irregularities. Experiments were performed on a glass surface with an ‘‘rms’’ slope of 30 deg, for the case of an incident wavelength with a size on the same order as the interface irregularities. The numerical models predict an enhancement of energy diffracted back toward the source, and results obtained in our ultrasonic laboratory strongly support the presence of this retroreflective energy. In terms of general scattering, it is found that, at smaller incident angles (relative to vertical), the 2‐D numerical results can give insight into the 3‐D experimentally observed scattering over most scattering angles. However, at larger incident angles, fundamental differences between 2‐D and 3‐D scattering may exist.
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